Because the structure of soil has important restrictions on the engineering properties of soil, the study of soil structure has become one of the core issues in soil mechanics research. Therefore, it is of great significance to study and analyze soil microstructure and obtain corresponding qualitative and quantitative information. The appearance of soil micro-testing technology, especially the appearance of scanning electron microscope, provides a basis for the research of soil micro-testing technology. Based on the above background, the research content of this article is the application and progress of scanning electron microscopy in geotechnical engineering. So far, some testing techniques have been developed, such as M-ray fluoroscopy, stereo photography, laser speckle method, M-ray diffraction, and optical microscope. This article mainly introduces the most commonly used scanning electron microscope testing technology in the study of soil microstructure, and through experimental simulation, the results show that at 500 ℃, the ratio of the internal pore area of the sample increases significantly, indicating that the internal cracking is serious, at this time The compressive strength of the sample is greatly reduced, and the bearing capacity is reduced. The directionality of the particles decreases with the increase of stress, and the fractal dimension of the particle distribution increases with the increase of stress, indicating that the degree of agglomeration of the soil particles decreases, the bearing capacity decreases, and the soil samples tend to be unstable. This is because the pore water continues to infiltrate under the action of external load, accumulates to a certain extent and then moves down to the bottom of the soil sample, so that the soil particles in this layer become loose and the cohesion decreases, resulting in unstable soil.

Fang Wang. Application and Development of Scanning Electron Microscope Testing Technology in Geotechnical Engineering. International Journal of Engineering Technology and Construction (2020), Vol. 1, Issue 2: 26-36. https://doi.org/10.38007/IJETC.2020.010203.

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